Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 131, Issue 22, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3271348
Keywords
microorganisms; photoexcitation; photosynthesis; quantum theory
Funding
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [744057] Funding Source: National Science Foundation
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The dynamics of excitation energy transfer within the B850 ring of light harvesting complex 2 from Rhodobacter sphaeroides and between neighboring B850 rings is investigated by means of dissipative quantum mechanics. The assumption of Boltzmann populated donor states for the calculation of intercomplex excitation transfer rates by generalized Foumlrster theory is shown to give accurate results since intracomplex exciton relaxation to near-Boltzmann population exciton states occurs within a few picoseconds. The primary channels of exciton transfer between B850 rings are found to be the five lowest-lying exciton states, with non-850 nm exciton states making significant contributions to the total transfer rate.
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